Webotsb tosum



Patented May 11, 1926.

WERNER URSUM, LWDWIG SGH'UTZ, AND LD'IDWIG TAUB, F ELBERFELD, GEANY, ASSIGNORS, BY MEBNE ASSIGNMENTS, T0 WINTER/0P CHEMICAL COMPANY, INC., OF NEW YUBK N. Y., A. CORPORATION Uh NEW YOR.

BABBITURIG ACID DERIVATIVE.

lto wrawing.

The present invention relates to the manutacture and .production of the hitherto unhiown barbituric acid derivatives having most probably the formula wherein R stands for monochlorocrotyl and R stands for monochlorocrotyl or another unsaturated or saturated substituent. The new products have proved to be valuable hypnotics, an average dose being from A to grams. They are free of noxious secondary efiects and have no narcotic action. The solution of their alkali metal salts donot alter and show no irritating action. a The process for producing the new products consists in converting malonic or cyanoacetic acid or their monosubstituted derivatives(alkyl-, arylor aralkyl derivatives)into the corresponding disubstituted derivatives by treatment with saturated or unsaturated halogenated 'alkylhalides and converting the resulting products into the barbituric acid derivatives by the methods known in the arts e. g. by condensation with urea. The

second substituent can also be introduced after the formation of the barbituric acid derivatives.

fully the following example is given the parts being by weight:

parts of mono-ethylmalonic acid diethyl ester are mixed together with 50 parts as ofmonochlorocrotylbromide. A solution of 6.2 parts of sodium in 100 parts of absolute alcohol is then added while stirring. The mixture is heated in a vessel provided with a reflux condenser until it is neutral, the alto cohol is distilled 0d, the residue is poured on ice, washed with water and distilled over. The monochlorocrotyl-ethyl malonic ester boils at 154-157 C. under a pressure of 18 mm. V

4a Subsequently 100 parts of this product is mixed with a solution prepared from 32.5 parts of urea in an alco olic solution of sodium ethylate (prepared from'20.8 parts of sodium and 330 parts of absolute alcohol).

tion from water.

Application filed December 17, 1924:. Serial No. 758,57.

The mixture is heated to boiling for several hours in a vessel provided with a reflux condenser, the. mixture is poured into water and acidified. The C-C-mono-chlorocrotylethyl barbituric acid CH3-CH=C oH, oo-Nn a 5 a 430-1 121 precipitates. It is purified by a crystalliza- Tt melts at 162 C. The C-C-dichlorocrotylbarbituric acid melts at 210212 C, the mono-chlorocrotylphenylbarbituric acid 1. The herein described barbituric acid derivatives having most probably the following general formula: In order to illustrate our new process more valuable hypnotics, substantially as described.

2. The herein described mono-chlorocrotyl-ethyl barbituric acid being whitish crystals soluble with difliculty in water, melting at 162 (1, and being a valuable hypnotic,

substantially as descrlbed.

In testimony whereof we have hereunto set our hands.

WERNER URS. LUDWTG SGHTTTZ.

LG? TA'UB. 

